Ablative idle stop



l 1965 J, L. CHAIVRE ETAL 3,208,301

ABLATIVE IDLE STOP Filed Jan. 23, 1962 JOHN L CHA/l RE WILL lAA l H 5114/ TH INVENT? Ml/ ATTORNEYS 3,28,3l Patented Sept. 28, 1965 3,208,301 ABLATIVE IDLE STOP John L. Chaivre, Detroit, and William H. Smith, Southfield, Mich, assignors to Ford Motor Company, Dearborn, Mich, a corporation of Delaware Filed Jan. 23, 1962, Ser. No. 168,118 7 Claims. (Cl. 74-526) This invention relates to the internal combustion engine carburetor art and more particularly to an apparatus for the provision of the automatic adjustment of the idle throttle setting from an original setting.

It is desirable in manufacturing internal combustion engines to set the original idling speed of the engine higher than that desired in the final product because of the greater friction existing in a new and unworn engine. This has customarily been accomplished by manually adjusting the idle rate of the engine to a high value and then manually readjusting the idling rate after the engine has been broken in.

It is the purpose of this invention to provide this adjustment automatically and with substantially no cost.

The manner of executing this invention is clearly shown in the sole figure of drawing. This figure of drawing depicts a portion of the throttle control mechanism of a carburetor. The carburetor control mechanism is generally indicated by the numeral 10. The carburetor control mechanism is motivated by control rod 11 which rotates movable throttle control plate 12 about an axis or shaft, the end of which has been denominated 16. The rotary movement of throttle control plate 12 is limited by throttle stop 13. This throttle stop 13 has been shown to be adjustable although this forms no part of the invention.

Movable throttle control plate 12 is deformed to provide ear 15. In normal use of the engine this car 15 abuts against the end of throttle stop 13 and so limits the rotational movement of movable throttle control plate 12.

When the carburetor is initially assembled, an ablative disc or member 14 is secured to either ear 15 or throttle stop 13. This ablative member 14 is preferably so secured by any suitable adhesive. As the engine is operated and the movable throttle control plate ear 15 impinges against throttle stop 13 the ablative member 14 gradually disintegrates and permits a slow decrease in the idling speed adjustment from that desirable in a new engine to that desired in a worn in engine.

The characteristics of ablative member 14 may be regulated to secure any desired number of contacts between ear 15 and throttle stop 13 before complete attrition or ablation of ablative member 14 occurs.

As a specific example of a satisfactory material for ablative member 14 mention is made of a mixture of 96 percent ordinary core sand and 4 percent of a conventional phenol-formaldehyde thermo setting resin. The sand and resin are intensively mixed prior to the completion of the thermo setting reaction of the phenol-formaldehyde resin. The sand-resin mixture is then molded to the desired shape and cured by the application of heat. This may readily be done by placing the sand-resin mixture in a metal mold heated to a temperature between 400 and 550 F.

It will be quite obvious to those skilled in the art that a large number of suitable compositions may be employed for ablative member 14. Practically any inert granular material may be substituted for the sand and any resinous material capable of cementing together the granular portion of the ablative stock may be employed. It is equally obvious that the durability of the ablative member may be enhanced by increasing the quantity of resinous material or decreased by increasing the quantity of granular material.

We claim as our invention:

1. In a carburetor control mechanism, a movable member, a stationary member arranged to limit the movement of the movable member, and an ablative member, said ablative member being interposed between the movable member and the stationary member so that attrition of the ablative member permits gradually increased movement of the movable member to the limit permitted by said stationary member.

2. In a carburetor control mechanism, a movable memher, a stationary member arranged to limit the movement of the movable member, and an ablative member, said ablative member being interposed between the movable member and the stationary member and consisting essentially of a granular material and a moldable material.

3. In a carburetor control mechanism, a movable memher, a stationary member arranged to limit the movement of the movable member, and an ablative member, said ablative member being interposed between the movable member and the stationary member and consisting essentially of sand and a settable resin material.

4. In a carburetor control mechanism, a movable throttle control plate, a stationary throttle stop arranged to limit the movement of the movable throttle control plate, and an ablative member, said ablative member being interposed between the movable throttle control plate and the stationary throttle stop.

5. In a carburetor control mechanism, a movable throttle control plate, a stationary throttle stop arranged to limit the movement of the movable throttle control plate, and an ablative member, said ablative member being interposed between the movable throttle control plate and the stationary throttle stop so that attrition of the ablative member permits greater movement of the movable throttle control plate.

6. In a carburetor control mechanism, a movable throttle control plate, a stationary throttle stop arranged to limit the movement of the movable throttle control plate, and an ablative member, said ablative member being interposed between the movable throttle control plate and the stationary throttle stop and consisting essentially of a granular material and a moldable material.

7. In a carburetor control mechanism, a movable throt tle control plate, a stationary throttle stop arranged to limit the movement of the movable throttle control plate, and an ablative member, said ablative member being interposed between the movable throttle control plate and the stationary throttle stop and consisting essentially of sand and a settable resin material.

References Cited by the Examiner UNITED STATES PATENTS 1,884,055 10/32 Mcllvried 24 l--32 2,179,380 11/39 Nieman 74-526 2,852,956 9/58 May 74493 2,861,307 11/58 Froberger.

2,895,345 7/59 McClure 64-2 8 BROUGHTON G. DURHAM, Primary Examiner. 

1. IN A CARBURETOR CONTROL MECHANISM, A MOVABLE MEMBER, A STATIONARY MEMBER ARRANGED TO LIMIT THE MOVEMENT OF THE MOVABLE MEMBER, AND AN ABLATIVE MEMBER, SAID ABLATIVE MEMBER BEING INTERPOSED BETWEEN THE MOVABLE MEMBER AND THE STATIONARY MEMBER SO THAT ATTRITION OF THE ABLATIVE MEMBER PERMITS GRADUALLY INCREASED MOVEMENT OF THE MOVABLE MEMBER TO THE LIMIT PERMITTED BY SAID STATIONARY MEMBER. 